Ornamental zigzag stitch sewing machine

ABSTRACT

An ornamental zigzag stitch sewing machine comprising zigzag pattern and feed controlling cams which respectively allow a needle to be laterally oscillated and a feed dog to be controlled in the length and direction of feed, the movements of the needle and feed dog being simultaneously adjusted by single manually operable means to produce ornamental zigzag patterns in various sizes similar to that of a base pattern.

United States Patent Torii [4 1 Oct. 10, 1972 ORNAMENTAL ZIGZAG STITCH SEWING MACHINE Inventor: Masaru Torii, Aichi-ken, Japan Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Japan Dec. 22, 1970 Assignee:

Filed:

Appl. No.:

Foreign Application Priority Data Dec. 22, 1969 Japan ..44/ 103230 US. Cl. ..ll2/l58 R int. Cl. ..D05b 3/02 Field of Search....l 12/158 R, 158 A, 158 F, 210

References Cited UNITED STATES PATENTS 3,455,258 7/1969 Kasuga ..112/158 R 3,070,050 12/1962 H011 et a1 ..1 12/158 F 3,433,092 3/1969 Hanyu ..112/158 R Primary Examiner-Patrick D. Lawson Attorney-Kemon, Palmer & Estabrook [s7] 8 ABSTRACT An ornamental zigzag stitch sewing machine comprising zigzag pattern and feed controlling cams which respectively allow a needle to be laterally oscillated and a feed dog to be controlled in the length and direction of feed, the movements of the needle and feed dog being simultaneously adjusted by single manually operable means to produce ornamental zigzag patterns in various sizes similar to that of a base pattern.

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MASArLu vwith PM; ML I ORNAMENTAL ZIGZAG STITCH SEWING MACHINE The present invention relates to an ornamental zigzag stitch sewing machine and more particularly to such machine capable of providing ornamental zigzag patterns in various shapes and sizes. There is already known a zigzag stitch sewing machine capable of providing ornamental zigzag patterns in various shapes and sizes. With the conventional apparatus, said zigzag stitch is performed by a pair of cams, one of which causes the needle to be moved crosswise andthe other of which controls fabric feed by the feed dog. To vary the sizes of zigzag stitch patterns, there should be controlled the movements of the needle and feed dog. However, the prior art machnice is only so designed as to carry out said controls separately. This complicates the work of changing pattern sizes and presents difficulties in providing the same shape of patterns in larger or smaller sizes.

The present invention provides a zigzag stitch sewing machine which comprises devices for controlling the movements of the needle and feed dog and means for simultaneously actuating said devices, thereby permitting ornamental patterns to be formed in various sizes by simple operation.

The present invention can be more fully understood from the following detailed description when taken in connection with reference to the accompanying drawings, in which:

FIG. 1 is a front view of an ornamental zigzag stitch sewing machine according to one embodiment of the invention in which machine frame is shown by two dots-dash lines;

FIG. 2 is a side view of the sewing machine shown in FIG. 1;

FIG. 3 is a front view of part of the sewing machine which includes a feed control dial and amplitude control lever;

FIG. 4 is a perspective view of first to third levers which are disassembled;

FIG. 5 is a sectional plan view of an automatic feed control section in the machine;

FIG. 6 is a perspective and exploded view of the feed control section shown in FIG. 5;

FIG. 7 is a front view showing cams;

FIG. 8 is a sectional plan view of part of the machine where an amplitude controller is located;

FIG. 9 shows two similar sewing ornamental patterns, one shown in A having larger size than the other in B;

FIG. 10 shows a front view of part of a sewing machine according to another embodiment of the invention;

FIG. 11 is a side view of part of the machine shown in FIG. 10;

FIG. 12 is a front view of part of the sewing machine shown in FIG. 10, including a feed control dial and amplitude control lever;

FIG. 13 is an exploded view of a face cam;

I FIG. 14 is a sectional plan view of part of the machine including automatic feed control section 80; and

FIG. 15 is a back-side view of part of the machine where an interconnecting lever and a drive transmission lever are shown.

There will now be described by reference to FIGS. 1 to 9 a zigzag stitch sewing machine according to an embodiment of the present invention. Referring to FIG. 1, numeral 1 denotes a machine frame indicated by two dots-dash lines to which there is fitted a main machine shaft 2. This main shaft 2 controls'thevertical movement of a needle bar 5 inserted into a needle support frame 4 which horizontally rocks about a pivotal shaft 3. Under the needle bar 4' there is provided reciprocating feed dog 131 operatively connected to a forked rod 130 described hereinafter so as to feed a fabricin the transverse of the shaft 2. To the main shaft 2 are loosely fitted a first cam assembly 7 and a second cam assembly 9 at a prescribed space in theaxial direction of said shaft 2. The first cam assembly 7 consists of a-plurality of zigzag pattern cams 6 so as periodically to change the lateral oscillation of the needle bar 4. The second cam assembly 9 comprises a plurality of feed control cams 8 so as cyclically to vary the direction and amount of the movement of the feed dog 131 and rotates together with the first cam assembly 7. A machine casing 10 shown in two dots-dash lines is fixed to the top of the frame 1 so as to cover the upper surface of the main shaft 2. Below the machine casing 10 are oscillatably supported first and second guide shafts 1 1 and 12 which are linearly arranged parallel with the main shaft 2. On each of these guide shafts 1 1 and 1 2 is formed a spline thereby to dispose the first one 11 above the first cam assembly 7 and the second one 12 above the second cam assembly 9. One end of the first guide shaft 11 is provided with a rockable projection 13. To the first guide shaft 11 is further slidably fitted a first contact member 14, into the base ring 15 of which there is loosely fitted said shaft 11. The end of the projection 13 contacts the underside of the horizontal pottion of an interlocking plate 19 of bell crank form. The interlocking plate 19 is rockably supported to the de pending portion 17 of the machine casing 10 by a pivot shaft 18. The interlocking plate 19 further has an engaging portion 20 formed to the lower end of its hanging portion. The guide shaft 12 has a forward projecting arm 21 (FIG. 5) fixed to one end. In the projecting end of the arm 21 is embedded a pin 22. With the second guide shaft 12 is slidably engaged the base ring 24 of a second contact member 23. The first contact member 14 slides with its base ring 15 along the first guide shaft 11 when the latter moves and selectively contacts the zigzag pattern cam 6 of the first cam assembly 7. The second contact member 23 also selectively contacts the control cam 8 of the second cam assembly due to the sliding of the base ring 24 of said contact member 23. To ensure said contact, the first and second guide shafts 11 and 12 are each fitted with a spring (not shown) for enforcing their one way rotation. Said first and second contact members 14 and 23 are made, as shown in FIG. 1, to move always at a prescribed interval. Said movement is effected by a mechanism comprising a slide plate (not shown) moved parallel with the main shaft 2 by the rotation of a dial disposed on the machine casing 10 and two engaging members projecting from the slide plate for engagement with the grooves 16 and 25 of the base rings 15 and 24. The feed control cams 8 of the second cam assembly 9 are so chosen to have a smaller number than the zigzag pattern cams 6 of the first cam assembly 7.

. Numeral 26 denotes a lever for varying the standard needle position, one end of which is pivoted to the shaft 18 together with the interlocking plate 19, and the other end of which is shaped into a forked portion 27. To the intermediate part of said lever 26 is rockably fitted one end of anamplitude controller 28 having a guide groove 29 formed in its surface. Said controller 28, together with the later described needle bar oscillating rod 65, constitute a first interlocking mechanism disposed between the first cam assembly 7 and needle bar 5. The backside of the rockable portion of said amplitude controller 28 is engaged with the engaging portion 20 of the interlocking plate 19. In the upper portion of the frontsurface of a stand on the frame 1 is provided, as shown in FIG. 3, a feed control dia] 31. In

the lower portion of saidsurface there are coaxially provided a standard position varying handle 36 for defining the positions left (abbreviated as L), middle (abbreviated as M) and right (abbreviated as R) of the needle bar and an amplitude control lever 40. Said feed control dial 31 bears an ordinary control scale 32 and a pattern size scale 33 for setting the size of a zigzag pattern to be sewn by co-operation of the first and second cam assemblies. Above the center of the upper periphery of the dial 31 is affixed a mark 34 by which there is set any desired graduation of the scale 32m 33. The pattern size scale 33 is so calibrated as to cause a pattern size to be successively reduced from the left side to the right of FIG. 3. Numeral 35 indicated therein represents a feed reversing push button engaging the center of the feed control dial 3l,'the functionof said push button 35 being described later. Numeral 39 of FIG. 1 denotes a pin embedded in a projection 38 formed on the shaft 37 of the handle 36 for changing the standard needle position, said pin 39 being inserted into the forked portion 27 of the lever .26 for varying the standard needle position. A first rockable lever 42 is securely connected with the shaft 41 of the amplitude control lever 40. As shown in FIG. 2, the shaft 41 is loosely supported with a second rockable lever 47 ahead of the first rockable lever 42 and a third rockable lever 53 behindsaid first lever 42. The first rockable lever 42 substantially assumes a T-form. In the upright portion 43 of said lever 42 is embedded a forward projecting pin 45. The end of the arm 44 of said lever 42 extending to the left of FIG. 1 is bent to constitute a screw socket or receptacle 46 (FIG. 4). At the left end of the second rockable lever 47 is provided a coupling member 48 for adjusting rod 64. Slightly rightward of said coupling member 48 is disposed a projecting edge 49 so as to face the underside of the screw receptacle 46 (FIG. 4). Into said projecting edge 48 49 inserted from below an adjustment screw 50. Above said projecting edge 49 is provided a projecting member 51 extending outward opposite to the direction in which said projecting edge 49 extends itself. Into said projecting a member 51 is inserted from below an adjustment screw 52. The third rockable lever 53 substantially assumes an L-form (FIG. 4). Into the end of the vertical portion 54 of said third lever 53 is securely fitted an engaging pin 56. The upper edge of the horizontal portion 55 of said third lever 53 is bent to form a projecting member 57 positioned right above the aforesaid projecting member 51.'Numeral 58 represents a torsion spring whose central winding is fixed to the shaft 41. One end 59 of said torsion spring 58 contacts the underside of the right portion of the first rockable lever 42, and the other end 60 contacts the underside of the left portion of the second rockable lever 47. As a result, the adjustment screw 50 .fitted to the second rockable lever 47 contacts the screw receptacle 46 of the first rockable lever 42, and the resulting rotation of the amplitude control lever 40 causes the shaft 41, the first rockable lever 42 fixed to said shaft 41 and the second rockable lever 47 loosely engaged therewith to rotate all together. The projecting member 57 of the third rockable lever 53 holds the lower end of a pull spring 61, the upper end of which is fitted to the, frame 1.

The amplitude control lever 40 is made to rock, as shown in FIG. 3, according to a scale 109 provided on a horizontal elongated slot 108 and-stopped at aydesired graduation of said scale; Said. stopped position is secured. by moving engaging members 110 normally disposed at both ends of said elongated slot 108 to engage the pin 45 therewith.

The needle bar. oscillating rod and the adjusting rod 64 are connected toeach other by a node 62. The needle bar oscillating rod 65 isfitted with a movable element 66 inserted into the guide groove 29 of the am-. plitude controller 28. The one side of the, amplitude controller 28 contacts a washer 63 supported on the node 62.

The aforementioned feed control dial 31 causes an actuating shaft 67 to retreat in proportion to the peripheral angle through which said dial 31 is made to rotate, while the depression of the reversion push button 35 allows said actuating shaft 67 to advance. To the shaft of the feed control dial 31 are fixed a cam 68 for varying the oscillation of the needle bar 5 and a cam for varying the movement of the feed dog 131'. The cam 68 has a cam surface 69 whose diameter propressively becomes larger according to the peripheral angles set by the pattern size scale 33 on the feed control dial 31 and thecam 70 has a cam surface 71 whose diameter is successively reduced similarly according to said peripheral angles.

Numeral 72 of FIG. 1 denotes a shaft for supporting cam contacting members,.which extends outside of the frame 1. With said support shaft 72 are loosely engaged, as best shown in. FIG. 4, cam contacting members 73 and 76. The first cam contacting member 73 is provided at one end-with a projecting contact pin 74 which contacts the amplitude varying cam 68 and at the other end with a forked portion 75 which engages the engaging pin 56 of the third rockable lever 53. On

- the same side of the second cam contacting member 76 I 2 and in greater detail in FIG. 6, together with a feed controller 102, constituted a second interlocking mechanism for the feed dog 131, which is disposed at the rear end of the machine casing 10. The automatic control arm 81 of the controller 102 faces the arm 21 fixed to the end of the second guide shaft 12. That end of said automatic control arm 81 which is disposed close to the second guide shaft 12 is pivoted by a pin 86 inserted throughone end of a support arm 85, the other end of which is fitted to the projecting shaft 84a secured to the depending portion 84 of the machine casing 10. Said pin 86 engages the annular groove 89 of a feed control element 88 vertically urged by the rotation of a handle 87a placed on the mechine casing 10, thereby controlling the vertical position of the pin 86. The automatic control arm 81 is provided at its rockable end with a rotor 82, to which there is connected the upper end of the interlocking rod 105 of the feed controller 102 so as to allow said interlocking rod 105 to slide only upward. Said arm 81 is further provided with a pin 83 which is paired with the pin 22 of the arm 21. Numeral 90 represents an elongate automatic rocking control plate provided at both ends with notches into which there are inserted the pin 22 of the arm 21 and the pin 83 of the automatic control arm 81. Alongside said rocking control plate 90 id disposed an elongate movement control plate 92. Both plates 90 and 92 are perforated at the center with a bore through which there is loosely inserted a pivotal shaft 93. To the forward end of the movement control plate 92 is connected one end of a bell crank 95 supported on the machine casing by a shaft 94, the other end of said crank 95 being connected to the connecting wire 79.

The automatic rocking control plate 90 including the movement control plate 82 and the pin 93 passing therethrough should be allowed to move freely back and forth. To this end, there is provided a support box 98, which is fitted to the machine casing by a pin 97. Said support box 98 has a longitudinal groove 99 into which there are inserted the rocking control plate 90 and movement control plate 92 and a lateral groove 100 through which the pin 93 freely slides back and forth. Numeral 101 (FIG. 1) represents a pair of hold screws of minute adjustment of the inclination of the support box 98.

Numeral 102 of FIG. 2 denotes an ordinary type feed controller which is rockably joumaled within the frame 1 and having a slide groove. Numeral 130 denotes a forked rod which at its lower end is operatively connected with the aforementioned feed dog 131 and with its upper forked part embraces an eccentric 132 fixed to the main shaft 2. The forked rod 130 is provided with a pivoted die engaged within a slide groove in a feed controller 102. The length and direction of the feed movement imparted to the feed dog 131 is controlled by the inclination of said controller 102. Said controller 102 is provided with a projecting pin 103, to which there is connected a spring 104 for inclining the controller 102 so as to increase the movement of the feed dog. The actuating shaft 67 operated by the feed control dial 31 and feed reversing push button 35 is so disposed as to face said controller 102. The forked portion 106 at the bottom end of the interlocking rod 105 engages the pin 103 of said controller 102, and the neck portion at the upper end of said rod 105 receives the rotor 82 provided on the arm 81 of the automatic feed control section 80. Numeral 107 is a coil spring wound about the interlocking rod 105. The movement of the arm 81 is transmitted to the interlocking rod 105 through the coil spring 107 so as to impart the swinging movement to the feed controller 102.

There will now be described the automatic sewing of a zigzag pattern illustrated in FIG. 9 using a sewing machine according to the aforesaid embodiment of the present invention. Referring to FIG. 2, the amplitude control lever 40 is operated, and the first rockable lever 42 is set at a maximum angle for adjustment of amplitude and maintained in this position by the engaging member 110 (FIG. 3). The first and second contact members 14 and 23 are jointly actuated by external mechanism to select cams adapted for automatic sewing of the illustrated pattern from among the zigzagpattern cams 6 of the first cam assembly and the feed control cams 8 of the second cam assembly 9 respectively. The pattern size scale 33 on the feed control dial is set by the mark 34, causing the cam surface 69 of the amplitude control cam 68 to contact the pin 74 and the cam surface 71 of the feed control cam to contact the pin 77. If, at this time, the left end graduation (representing a maximum value) of the pattern size scale 33 falls on the mark 34, then the pin 74 contacts the smallest diameter portion of the cam surface 69 and the pin 77 contacts the largest diameter portion of the cam surface 71. If the right end graduation (denoting a minimum value) of said pattern size scale 33 is set by the mark 34, then the pin 74 contacts the largest diameter portion of the cam surface 69 and the pin 77 contacts the smallest diameter portion of the cam surface 71. As the result of the above-mentioned operation, the cam contacting members 73 and 76 rock about the support shaft 72 according to the required size of patterns to be sewn up. The rocking of the cam contacting member 73 urges the third rockable lever 53 against the force of the pull spring 61, causing the projecting member 57 of said third rockable lever 53 to force down the control screw 52 of the second rockable lever 47. Accordingly, the second lever 47 rocks against the force of the spring 58 and the control screw 50 is urged downward off the screw receptacle of the first rockable lever 43, causing the adjusting rod 64 and needle bar oscillating rod 65 to be moved in interlocking relationship and the movable member 66 to slide away from the shaft 30 through the guide groove 29 of the amplitude controller 28.

In brief, only when the pattern size is changed, the movable member 66 shifts its position on the amplitude control cam 68 and not by the amplitude control lever 40. As a result, the first contact member 14 contacts the zigzag pattern cam 6, and the first guide shaft 11 rocking according to the peripheral form of said cam 6 automatically varies in conformity with the set graduation of the pattern scale 33 the degree of oscillation to which the needle support rod 4 is subjected through the rockable projecting member 13, interlocking plate 19 and then through the amplitude controller 28 and needle bar oscillating rod 64. The rocking of the cam contacting member 76 causes the interlocking rod 79 to pull the bell crank which in turn urges the movement control plate 92, together with the rocking control plate 90 and pin 93, against the force of the pull spring 96. As a result, the pin 93 slides through the lateral guide groove of the support box 98, with the resulting movement of the rocking control plate 92 having elongate holes 91 engaging the pins 22 and 83. The movement of the pin 93 takes place between the fixed pins 22 and 83 so as to vary the distances form the pins 22 and 83 to the pin 93.

In short, only when the pattern size is changed, the movement of the pin 93 is controlled between the pins 22 and 83 by the feed controlcam 70.'Thus the second contact member 23 contacts the feed control cam 8 and the second guide shaft 12 rocking according to the peripheral formof said cam 8 causes the rocking control plate 90 to rockiabout the pin 93 by the pin 22 of v the arm 21', said control plate 90 in turn causing the automatic control arm 81 to rock about the pin 86,

-' thereby automatically varying through the interlocking 'rod 105 connected to the rocking end of said arm 81 the'degree of inclination of the feed controller 102 and As apparent from the foregoing description, when the contact pin 74 contacts the smallest diameter portion of the cam surface 71, causing the movable member'66 to be positioned at the rocking end of the amplitude controller 28, and the contact pin 77 contacts the largest diameter portion of the cam surface 71, causing the pin 93 to be disposed farthest from the 'pin 22, then there are produced patterns in such a large size as illustrated in FIG. 9A by cooperation between the first and second cams 7 and 9 contacted by the first and second contact members 14 and 23 respectively. The sewing of patternshaving such a small size shown in FIG. 9B is performed when the contact pin 74 contact the largest diameter portion of the cam surface 69, causing the movable element 66 to be'positioned close to the center of rotation of the amplitude cotroller 28, the contact pin 77 contacts the smallest diameter portion of the cam surface .71, causing the pin 93 to be drawn near the pin 22.

There will now be described by reference to FIGS. to a' zigzag stitch sewing machine according to another embodiment of the present invention. The sewing machine according to this embodiment is intended, as. illustrated in FIG. 12, to vary proportionately the lateral-oscillation of a needle barand the movement of a feed dog by an amplitude control lever 40d provided on the front surface of a standon a frame 1, thereby enablingzigzag patterns to be sewn in any size by cop operation between the first and second cam assemblies 7 and 9 described in connection with the first embodiment.

, 45b, and at the end. of the horizontal arm 44a is pro- ."vided a coupling section 48a for connection with the adjusting rod 64 described in the first embodiment. To the rockable lever 42a is fitted a face cam 1 1 l. The aminto the guide. groove of the amplitude controller 28 of the first embodiment by more reducing the distance from the shaft center to the pin 45a of said control lever 40a than is usually allowed, though it may rock through the same peripheral angle. A scale 109a provided at an elongate opening 1080 indicates adjustment of amplitude ranging from 0 to 7 mm in digits of 0 to 7, the digits of 5 to 7 being used in increasing or decreasplitude control lever 40a is so designed as to increase v the travelling distance of a movable element 66 fitted ing the pattern size That portion of the face cam 11 which corresponds to the graduations of 0 to 5 on the scale 109a is made plain and that portion corresponding to 5 to 7 constitutes an inclined cam surface 1 12. Numeral 113 is a vertically elongate automatic feed control lever disposed in front of a stand on the frame 1 and pivoted at the intermediate part by a shaft 115. 'To the bottom end of said control lever 1 13 is fitted a projecting pin 114 contacting the face cam 111. On the shaft 115 is provided a spring 116 for pressing the contact pin 114 against the face cam 111. The feed controlv dial 31a disposed above the amplitude control lever 40a has an ordinary, feed control scale 32 a and automatic pattern size control scale 33a. To the shaft of said dial 31a is fixed a cam body 117, which has an annular grooved cam 1 18 formed along the periphery. Said cam 118 has a forward bent cam groove 119 so as to correspond to said pattern size scale 33a. In the grooved campll8 is inserted a pin 121 fitted to the bottom end of a rockable lever 120 having its upper end rotatably fitted to the frame 1 and hanging substantially vertically from said frame 1. Numeral 122 is a restricting projecting member formed by bending the bottom end of said rockable lever 120 so as to embrace the rear part of the automatic feed control lever 113 extending from the shaft 115 to the upper end. The projecting member 122 is so designed that when any graduation within the prescribed rangeof the feed control scale 32a. on the feed lever control dial 31a is set by the mark 34a, the rockable lever 120 having the pin 121 fitted into the grooved cam 118 rocks in the direction of the arrow a (FIG. 11), causing the upperpart of the automatic feed control'lever 113 to be pushed forward by the restricting projecting member 122 and the contact pin 114 to be fully separated from the face cam 111; and when the automatic pattern size scale 33a is set by the mark 34a, the pin 121 enters the forward bent cam groove 119, causing the rockable lever 120 to be urged in the direction of the arrow b (FIG. 1l)and the automatic feed control lever- 113 to be released from restriction by the restricting projectingmember 122,,

thereby allowing the pin.121 to contact any point on the facecam 111 by the force of the spring 1 16.

As in the preceding embodiment, an automatic feed control section denoted by numeral a constitutes, together with the feed controller 102a, a second drive mechanism for the feeddog. Said feed control section 80a is actuated by the feed control lever 113 whose rotating peripheral angle is defined by the face cam l l l and its inclined cam surface 112. To describe in greater detail, said feed control section 80a has a rockable arm 21a fitted to one end of the second guide shaft 120 so as to extend rearward. Near the rear end of said arm 21a is formed an elongate groove 22a extending toward said rear end. The feed controller 102a has an automatic control arm 81a so as to face said rockable arm 21a. The automatic control arm 81a has a brace affixed thereto. As a result, when removed from the second guide shaft 12a, said arm 81a presents a forked shape at one end. Both walls defining said forked portion are perforated with a pair of elongate control holes 123.

That end of the control, arm 81a which is close to the second guide shaft 12a is pivoted by a pin 86a disposed at one end of a support arm a, the other end of which is fitted to the projecting shaft 84b of the depending portion 84a of the machine casing 10a. Said pin 86a is engaged, as in the preceding embodiment, with the annular groove 89a of a minute adjustment element 88a so disposed as to move vertically with the rotation of the handle 87av placed on the machine casing 10a thereby to adjust the vertical position of said pin 86a. Into the elongate adjustment hole 123 of the arm 81a is fitted a shaft 124 (FIG. 14) sliding toward .or away from the second guide shaft 12a. Said shaft 124 passes through a connection plate 82a holding the head of the interlocking rod 105a of the feed controller 102a and an elongate groove formed at the upper end of the later described drive transmission lever 125. In the. intermediate part of the control arm 81a is provided a projection pin 83a which is free to slide through the groove 22a of therockable arm 21a. Numeral 125 represents a drive transmission lever pivoted at the bottom end to the frame 1a and disposed substantially parallel with the feed control lever 133. Said drive transmission lever 125 constitutes a link system in conjunction with a link bar 127, both ends of which are pivoted to the intermediate part of said drive transmission lever 125 and the upper end of the feed control lever 113. The interlocking rod 105a is connected to the feed controller 102a in the same manner as the interlocking rod 105a of the preceding embodiment.

There will now be described the operation of the second embodiment constructed as described above. The feed control scale 33a of the feed control dial 31a is set by the mark 34a to release the feed control lever 113 from restriction by the projecting member 122 for limiting the movement of the rockable lever 120, and the amplitude control lever 40a is set by any of the graduations of 5 to 7 on the scale 109a. Under such arrangement, the inclined cam surface 112 of the face cam l l 1 contacts the contact pin 1 14 and the feed control lever 113 is inclined in the direction of the arrow b of FIG. 11 by the force of the spring 116 with the resulting interlocking movement of the drive transmission lever 125 through the link bar 127, causing the slidable shaft 124 connected to the upper end of said drive transmission lever 125 to slide through the elongate adjustment hole 123 away from the pin 86a. The stroke of the slidable shaft 124 increases as the amplitude control lever 40a is thrown toward the larger digit of the graduations of 5 to 7 on the scale 109a, thus varying the ratio which the distance between the pin 83a and slidable shaft 124 bears with the distance between the pins 83a and 86a. As the slidable shaft draws nearer to the end of the elongate control hole 123, it makes a larger vertical movement. The rotation of the amplitude control lever 40a causes the movable element 66 to slide, as in the first embodiment, through the guide groove 29 of the amplitude controller 28 away from the shaft to the same extent as the movement of the slidable shaft 124 through the elongate control hole 123, by means of the rockable lever 42a connected to said amplitude control lever a and the adjusting rod 64 connected to said rockable lever 42a.

When, after the aforesaid operation of the amplitude control lever 40a, the first and second contact members l4 and 23 are made to contact the any selected one of the zigzag pattern cams and feed control cams 8 of the first and second cam assemblies respectively for rotation of the main shaft, then the oscillation of the needle bar support frame 4 following the peripheral fonn of said selected zigzag pattern cam 6 varies within the range of graduation of 5 to 7 on the scale 109a. At the same time, the rocking of the second guide shaft 12a following the outer diameter of the feed control cam 8 causes the control arm 81a to rock vertically about the pin 86a, thereby changing the extent of the rocking slide of the slidable shaft 124 according to its position in the elongate control hole 123. Accordingly, the feed controller 102a rocks in the direction of the normal and reverse feed through the connection plate 82a and interlocking rod 105a, varying the movement of the feed dog within the range of graduations of 5 to 7 on the scale 109a in proportion to the extent of amplitude. This enables the patterns sewn to be changed in size in similar relationship as illustrated in FIGS. 9A and 9B.

As mentioned above, the zigzag stitch sewing machine of the present invention comprises first adjustable linkage means to interlock a needle bar with a first cam assembly periodically changing the lateral oscillation of said needle bar; second adjustable linkage means to interlock a feed dog with a second cam assembly periodically varying the movement of said feed dog; single manually operable setting means operable from outside of a machine frame so as proportionately to vary the lateral oscillation of the needle bar by the first cam assembly and the movement of the feed dog by the second cam assembly whereby patterns sewn up by co-operation between the first and second cam assemblies assume similar forms to a given original size. According to the present invention, the oscillation of the needle bar by the first cam assembly and the movement of the feed dog by the second cam assembly are always made to vary in proportion, enabling the resulting patterns to be equally magnified or contracted crosswise and lengthwise, that is, to assume exact similar forms free from any deformation.

What we claim is:

1. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, I

b. longitudinally reciprocable and laterally movabl needle bar means carried by said frame,

c. a movable feed dog mounted for co-operation with said needle bar means,

d. a drive shaft within said frame,

e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting lateral movement to said needle bar means according to a predetermined pattern,

f. first adjustable linkage means operatively interconnected between said zigzag pattern cam and needle bar means,

g. at least one feed controlling camdrivingly connected with said drive shaft for controlling the length and direction of the feed movement imparted to the feed dog according to a predetermined pattern,

h. second adjustable linkage means operatively interconnected between said feed controlling cam and said feed dog,

i. single manually operable setting meansoperatively connected with said first and second adjustable linkage means for adjusting the same simultaneously so as to proportionally vary the width of lateral movement imparted to .the needle bar means and the length of feed movement imparted to the feed dog,

j. wherebyupon the operation of said single manually setting means, ornamental patterns are produced in various sizes similar to the basic pattern.

2. An ornamental zigzag stitch sewing machine comprising a. a hollow frame,

b. longitudinally reciprocable and laterally movable needle bar means carried by said frame,

c. a movable feed dog mounted for co-operation with said needlebar means,

a drive shaft within said frame,

at least one zigzag pattern cam drivingly connected with 1 said drive shaft for imparting the lateral movement to said needle bar means according to a predetermined pattern,

f; first adjustable motion transmitting means operatively interconnected between said zigzag pattern cam and said needle bar means,

g. motion imparting means operatively interconnected between said drive shaft and said feed dog for imparting feed movement to the feed dog,

h. adjusting means for said motion imparting means to vary the length and direction of the feed movement of the feed dog,

. at least one feed controlling cam drivingly connected with said drive shaft for controlling the feed movement of the feed dog according to a predetermined pattern,

j. second adjustable motion transmitting means operatively interconnected between said feed controlling cam and said adjusting means,

.. single manually operable setting means operatively connected with said first and second adjustable motion transmitting means for adjusting the same simultaneously so as to proportionally vary the width of lateral movement imparted to the needle bar means and the length of feed movement imparted to the feed dog,

. whereby upon the operation of said single manually setting means, ornamental zigzag patterns are produced in various sizes similar to the basic pattern.

3. An ornamental zigzag stitch sewing machine comprising a. va hollow frame,

b. longitudinally reciprocable and laterally movable needle bar means carried by said frame,

c. a movable feed dog mounted for co-operation with said needle bar means,

d. a drive shaft within said frame,

e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting the lateral movement to said needle bar means according to a predetermined pattern,

f. first adjustable linkage means operatively interconnected between said zigzag pattern cam and needle bar means, I j y g. at least one feed controlling cam drivingly connected with said drive shaft for controlling the length and direction of the feed movement imparted to the feed dog according to a predetermined pattern, I

h. second adjustable linkage means operatively interconnected between said feed controlling cam and;

feed dog,

i. adjusting means for each of said both adjustable linkage means,

j. individual manually operable means for imparting adjusting movement to each of said adjusting means,

k. and additional adjusting movement imparting means operable by one of said manually operable means and mechanically connected to said first and second adjustable linkage means for adjusting the same simultaneously so as to proportionally very the width of lateral movement imparted to the needle bar means and the length offeed movement imparted to the feed dog,

1. whereby upon the operation of said one manually operable means, ornamental zigzagupatterns are produced in various sizes similar to the basic pattern.

4. An ornamental zigzag stitch sewing machine as defined in claim 3, including means for selectively coupling said one manually operable means to said first and second adjustable linkage means for joint movement thereof by operation of said one manually operable means and disconnecting said coupling to permit individual operation of said both adjusting means by said individual manually operable means.

5. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, I b. longitudinally reciprocable and laterally movable needle bar means carried by said frame, c. a movable feed dog mounted for co-operation with said needle bar means, (1. drive shaft within said frame, e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting lateral movement to said needle bar means according to a predetermined pattern, f. first adjustable motion transmitting means operatively interconnected between said zigzag pattern cam and said needle bar means, g. first adjusting means mounted in said first adjustable motion transmitting means i for adjusting the amplitude of lateral movement of said needle bar means,

h. first manually operable means for said first adjusting means,

i. motion imparting means operatively interconnected between said drive shaft and said feed dog for imparting feed movement to the feed dog,

j. second adjusting means for said motion imparting means operatively to vary the length and direction of feed movement of the feed dog,

k. at leastv one feed controlling cam drivingly connected with said drive shaft for controlling the feed movement of the feed dog according to a predetermined pattern,

I. second adjustable motion transmitting means operatively interconnected between said feed controlling cam and said second control means,

m. second manually operable means operable exteriorly of the frame and engageable with said second adjusting means for moving the same,

n. and additional adjusting movement imparting means for connecting said second manually operable means to said first adjusting means and said second adjustable motion transmitting means and effective upon movement to certain positions of said second manual operable means to impart setting movement to said second adjusting means only and upon movement to other positions to impart joint adjusting movement to said first adjusting means and second adjusting movement transmitting means,

. whereby upon movement to said other positions of said second manually operable means, proportional ornamental zigzag patterns are produced in various sizes similar to the basic pattern.

6. An ornamental zigzag stitch sewing machine as defined in claim 5, said additional adjusting movement imparting means including a pair of setting cams operable by said second manually operable means and a pair of cam follower for the setting cams operatively and respectively associated with said first adjusting means and said second adjustable motion transmitting means.

7. An ormtmcntnl zigzag stitch sewing machine comprising a. a hollow frame,

b. longitudinally reciprocable and laterally movable needle bar means carried by said frame,

c. a movable feed dog mounted for co-operation with said needle bar means,

d. drive shaft within said frame,

e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting the lateral movement to said needle bar means according to a predetermined pattern,

f. first adjustable motion transmitting means operatively interconnected between said zigzag pattern cam and said needle bar means,

g. first adjusting means for said first adjustable motion transmitting means for controlling the amplitude of the lateral movement of said needle bar means,

ing means,

i. motion imparting means operatively interconnected between said drive shaft and said feed dog for imparting feed movement to the feed dog,

j. second adjusting means for said motion imparting means operatively to vary the amplitude and direction of feed movement of the feed dog,

k. second manually operable means operable exteriorly of the frame and engageable with said adjusting means for moving the same,

i. at least one feed controlling cam drivingly connected with said drive shaft for controlling the feed movement of the feed dog according to a predetermine pattern,

m. second adjustable motion transmitting means operatively interconnected between said feed controlling cam and said second adjusting means,

n. setting cam means operable by said first manually operable means,

0. and cam follower means for said setting cam means operatively connected with said second adp. it??? "i ri iiil'l n'iiri ad said second adjustable transmitting means are simultaneously adjusted by operation of said first manually operable means, ornamental zigzag patterns are produced in various sizes similar to the basic pattern.

8. An ornamental zigzag stitch sewing machine as defined in claim 7,

including means for disengaging said cam follower means from said setting cam means upon movement to certain positions of said second manual operable means to impart setting movement to said first adjusting means only and for engaging said cam follower means to said setting cam means upon movement to other positions of said second manual operable means to impart adjusting movement to said first adjusting means and second adjusting movement transmitting means. 

1. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, b. longitudinally reciprocable and laterally movable needle bar means carried by said frame, c. a movable feed dog mounted for co-operation with said needle bar means, d. a drive shaft within said frame, e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting lateral movement to said needle bar means according to a predetermined pattern, f. first adjustable linkage means operatively interconnected between said zigzag pattern cam and needle bar means, g. at least one feed controlling cam drivingly connected with said drive shaft for controlling the length and direction of the feed movement imparted to the feed dog according to a predetermined pattern, h. second adjustable linkage means operatively interconnected between said feed controlling cam and said feed dog, i. single manually operable setting means operatively connected with said first and second adjustable linkage means for adjusting the same simultaneously so as to proportionally vary the width of lateral movement imparted to the needle bar means and the length of feed movement imparted to the feed dog, j. whereby upon the operation of said single manually setting means, ornamental patterns are produced in various sizes similar to the basic pattern.
 2. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, b. longitudinally reciprocable and laterally movable needle bar means carried by said frame, c. a movable feed dog mounted for co-operation with said needle bar means, d. a drive shaft within said frame, e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting the lateral movement to said needle bar meaNs according to a predetermined pattern, f. first adjustable motion transmitting means operatively interconnected between said zigzag pattern cam and said needle bar means, g. motion imparting means operatively interconnected between said drive shaft and said feed dog for imparting feed movement to the feed dog, h. adjusting means for said motion imparting means to vary the length and direction of the feed movement of the feed dog, i. at least one feed controlling cam drivingly connected with said drive shaft for controlling the feed movement of the feed dog according to a predetermined pattern, j. second adjustable motion transmitting means operatively interconnected between said feed controlling cam and said adjusting means, k. single manually operable setting means operatively connected with said first and second adjustable motion transmitting means for adjusting the same simultaneously so as to proportionally vary the width of lateral movement imparted to the needle bar means and the length of feed movement imparted to the feed dog, l. whereby upon the operation of said single manually setting means, ornamental zigzag patterns are produced in various sizes similar to the basic pattern.
 3. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, b. longitudinally reciprocable and laterally movable needle bar means carried by said frame, c. a movable feed dog mounted for co-operation with said needle bar means, d. a drive shaft within said frame, e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting the lateral movement to said needle bar means according to a predetermined pattern, f. first adjustable linkage means operatively interconnected between said zigzag pattern cam and needle bar means, g. at least one feed controlling cam drivingly connected with said drive shaft for controlling the length and direction of the feed movement imparted to the feed dog according to a predetermined pattern, h. second adjustable linkage means operatively interconnected between said feed controlling cam and feed dog, i. adjusting means for each of said both adjustable linkage means, j. individual manually operable means for imparting adjusting movement to each of said adjusting means, k. and additional adjusting movement imparting means operable by one of said manually operable means and mechanically connected to said first and second adjustable linkage means for adjusting the same simultaneously so as to proportionally very the width of lateral movement imparted to the needle bar means and the length of feed movement imparted to the feed dog, l. whereby upon the operation of said one manually operable means, ornamental zigzag patterns are produced in various sizes similar to the basic pattern.
 4. An ornamental zigzag stitch sewing machine as defined in claim 3, including means for selectively coupling said one manually operable means to said first and second adjustable linkage means for joint movement thereof by operation of said one manually operable means and disconnecting said coupling to permit individual operation of said both adjusting means by said individual manually operable means.
 5. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, b. longitudinally reciprocable and laterally movable needle bar means carried by said frame, c. a movable feed dog mounted for co-operation with said needle bar means, d. drive shaft within said frame, e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting lateral movement to said needle bar means according to a predetermined pattern, f. first adjustable motion transmitting means operatively interconnected between said zigzag pattern cam and said needle bar means, g. first adjusting means mounted in said first adjustable motion transmitting means for adjusting the amplitude of lateral movement of Said needle bar means, h. first manually operable means for said first adjusting means, i. motion imparting means operatively interconnected between said drive shaft and said feed dog for imparting feed movement to the feed dog, j. second adjusting means for said motion imparting means operatively to vary the length and direction of feed movement of the feed dog, k. at least one feed controlling cam drivingly connected with said drive shaft for controlling the feed movement of the feed dog according to a predetermined pattern, l. second adjustable motion transmitting means operatively interconnected between said feed controlling cam and said second control means, m. second manually operable means operable exteriorly of the frame and engageable with said second adjusting means for moving the same, n. and additional adjusting movement imparting means for connecting said second manually operable means to said first adjusting means and said second adjustable motion transmitting means and effective upon movement to certain positions of said second manual operable means to impart setting movement to said second adjusting means only and upon movement to other positions to impart joint adjusting movement to said first adjusting means and second adjusting movement transmitting means, o. whereby upon movement to said other positions of said second manually operable means, proportional ornamental zigzag patterns are produced in various sizes similar to the basic pattern.
 6. An ornamental zigzag stitch sewing machine as defined in claim 5, said additional adjusting movement imparting means including a pair of setting cams operable by said second manually operable means and a pair of cam follower for the setting cams operatively and respectively associated with said first adjusting means and said second adjustable motion transmitting means.
 7. An ornamental zigzag stitch sewing machine comprising a. a hollow frame, b. longitudinally reciprocable and laterally movable needle bar means carried by said frame, c. a movable feed dog mounted for co-operation with said needle bar means, d. drive shaft within said frame, e. at least one zigzag pattern cam drivingly connected with said drive shaft for imparting the lateral movement to said needle bar means according to a predetermined pattern, f. first adjustable motion transmitting means operatively interconnected between said zigzag pattern cam and said needle bar means, g. first adjusting means for said first adjustable motion transmitting means for controlling the amplitude of the lateral movement of said needle bar means, h. first manually operable means for said first adjusting means, i. motion imparting means operatively interconnected between said drive shaft and said feed dog for imparting feed movement to the feed dog, j. second adjusting means for said motion imparting means operatively to vary the amplitude and direction of feed movement of the feed dog, k. second manually operable means operable exteriorly of the frame and engageable with said adjusting means for moving the same, l. at least one feed controlling cam drivingly connected with said drive shaft for controlling the feed movement of the feed dog according to a predetermine pattern, m. second adjustable motion transmitting means operatively interconnected between said feed controlling cam and said second adjusting means, n. setting cam means operable by said first manually operable means, o. and cam follower means for said setting cam means operatively connected with said second adjustable motion transmitting means, p. whereby said first adjusting means and said second adjustable transmitting means are simultaneously adjusted by operation of said first manually operable means, ornamental zigzag patterns are produced in various sizes similar to the basic pattern.
 8. An ornamental zigzag stitch sewing machine as defined in claim 7, includiNg means for disengaging said cam follower means from said setting cam means upon movement to certain positions of said second manual operable means to impart setting movement to said first adjusting means only and for engaging said cam follower means to said setting cam means upon movement to other positions of said second manual operable means to impart adjusting movement to said first adjusting means and second adjusting movement transmitting means. 